the Denver Post that Holmes rammed his head into the wall of his jail cell to inflict self-harm at the Arapahoe County jail.
The Associated Press reports Holmes has since been returned to his cell, and sources say he is able to move and talk.
Denver reports that Holmes has made several "half-hearted" suicide attempts, with another involving jumping off of his bed.
The Arapahoe County undersheriff wouldn't comment on the reports.
Holmes had been due in court on Thursday for a routine hearing, but his defense attorneys
filed an emergency motion
Wednesday asking that the hearing scheduled for an 8:30 a.m. on Nov. 15 be delayed.
"Without waiving any of Mr. Holmes' legal, medical, psychological or psychiatric privileges, counsel are compelled to inform the Court that as a result of developments over the past 24 hours, Mr. Holmes is in a condition that renders him unable to be present in court for tomorrow's hearing," the document said.
Prosecutor Rich Orman had objected to the motion, saying the defense should be required to reveal Holmes' condition before asking for a continuance.
"The defendant's position seems to be that he can request the court take action on his claim of a 'condition' and at the same time keep information about that 'condition' secret from the prosecution. This is contrary to Colorado law, which holds that a privilege is waived when the privilege holder makes a claim that puts the privileged information at issue," the response said.
Arapahoe County District Judge William B. Sylvester granted a continuance and postponed the Thursday hearing until Dec. 10.
Holmes, a 24-year-old former neuroscience graduate student, is accused of opening fire during a midnight showing of "The Dark Knight Rises" on July 20 at the Century Aurora 16. Twelve people were killed and at least 58 were injured.
The Aurora rampage was one of the bloodiest acts of gun violence in the United States in recent years.
He could face the death penalty if convicted.